Virtual Private LAN Services
7750 SR OS Services Guide Page 503
alarm-cells
Syntax [no] alarm-cells
Context config>service>vpls>sap>atm
Description This command configures AIS/RDI fault management on a PVCC. Fault management allows PVCC
termination to monitor and report the status of their connection by propagating fault information
through the network and by driving PVCC’s operational status.
When alarm-cells functionality is enabled, a PVCC’s operational status is affected when a PVCC
goes into an AIS or RDI state because of an AIS/RDI processing (assuming nothing else affects
PVCC’s operational status, for example, if the PVCC goes DOWN, or enters a fault state and comes
back UP, or exits that fault state). RDI cells are generated when PVCC is operationally DOWN. No
OAM-specific SNMP trap is raised whenever an endpoint enters/exits an AIS or RDI state, however,
if as result of an OAM state change, the PVCC changes operational status, then a trap is expected
from an entity the PVCC is associated with (for example a SAP).
The no command disables alarm-cells functionality for a PVCC. When alarm-cells functionality is
disabled, the PVCC’s operational status is no longer affected by the PVCC’s OAM state changes due
to AIS/RDI processing. Note that when alarm-cells is disabled, a PVCC will change operational
status to UP from DOWN due to alarm-cell processing). RDI cells are not generated as result of
PVCC going into an AIS or RDI state, however, the PVCC’s OAM status will record OAM faults as
described above.
Default Enabled for PVCCs delimiting VPLS SAPs.
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